Answer:
The answer is <u>b = 30 ft</u> and <u>h = 40 ft</u>.
Step-by-step explanation:
Given:
The height of a parallelogram is 10ft more than its base
The area is 1200 ft².
Now, to solve for b and h.
Let the base (b) be 
And the height (h) is = 
Area = 1200 ft².
Now, to solve we put formula of area:


<em />
<em>Subtracting both sides by 1200 we get:</em>

Now, solving the quadratic equation:



and 
<em>Subtracting Adding both sides </em>
<em>both sides by 30 we get:</em>
<em>by 40 we get:</em>

So, we will take the positive result.

<em>Thus, the base (b) = 30 ft.</em>
Now, getting the height (h) by substituting the value of
:

Therefore, the answer is b = 30 ft and h = 40 ft.